Dabry's sturgeon

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Dabry's sturgeon
CITES Appendix II (CITES)[2]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Acipenseriformes
Family: Acipenseridae
Genus: Acipenser
Species:
A. dabryanus
Binomial name
Acipenser dabryanus
Duméril, 1869
Synonyms[3][4]
  • Sinosturio dabryanus (Duméril 1869)

Dabry's sturgeon (Acipenser dabryanus), also known as the Yangtze sturgeon, Changjiang sturgeon and river sturgeon, is a species of fish in the sturgeon family, Acipenseridae.[5] It is endemic to China and today restricted to the Yangtze River basin,[1] but was also recorded from the Yellow River basin in the past.[6][7] It was a food fish of commercial importance. Its populations declined drastically, and since 1988, it was designated an endangered species on the Chinese Red List in Category I and commercial harvest was banned.[5][1] It has been officially declared extinct in the wild by the IUCN as of July 21, 2022.[1]

Appearance[edit]

This sturgeon has been known to reach 2.5 m (8.2 ft) in length, but it is usually much smaller.[8] Its body is blue-gray above and yellowish white on the belly, with five rows of scutes. The head is triangular and the snout is long with the mouth located on the underside. There are two pairs of barbels.[9]

Behavior[edit]

The fish lives in slow-moving river waters over substrates of sand and mud. It feeds on aquatic plants, invertebrates, and small fish. This species is potamodromous, taking part in a migration, but never leaving fresh water.[9] It spawns in the upper Yangtze, mainly during March and April, and sometimes around November and December. Males spawn each year, but most females do not. The female produces 57,000 to 102,000 eggs.[9]

Conservation status[edit]

This was once a common fish in the Yangtze system.[9] It was known from the main river and some of its larger tributaries, as well as some lakes attached to the system. By the late 20th century, it was extirpated from the lower river and limited to the upper reaches in Sichuan. The main causes of its drastic decline include overfishing, including the overharvesting of juveniles. The construction of dams, notably the Gezhouba Dam and Three Gorges Dam, blocked the movement of the fish along the river, restricting it to the upper reaches. It also caused habitat fragmentation and degradation. Increased development and deforestation on land near the river has increased pollution from wastewater and runoff.[1] The Yangtze basin is and was its main range, but it has also been found in the Yellow River basin, with the last records in the 1960s.[6][7]

The fish has been bred in captivity since the 1970s. Thousands of individuals have been released into the Yangtze basin, but are apparently not breeding. Nevertheless, this restocking may be the only effort preventing the extinction of the species.[1]

A specimen of Acipenser dabryanus exhibited in the Museum of Hydrobiological Sciences of Wuhan Institute of Hydrobiology

See also[edit]

References[edit]

  1. ^ a b c d e f Qiwei, W. (2022). "Acipenser dabryanus". IUCN Red List of Threatened Species. 2022: e.T231A61462199. doi:10.2305/IUCN.UK.2022-1.RLTS.T231A61462199.en. Retrieved 21 July 2021.
  2. ^ "Appendices | CITES". cites.org. Geneva, Switzerland: CITES Secretariat. Archived from the original on 5 December 2017.
  3. ^ Froese, R.; Pauly, D. (2017). "Acipenseridae". FishBase version (02/2017). Retrieved 18 May 2017.
  4. ^ "Acipenseridae" (PDF). Deeplyfish- fishes of the world. Retrieved 18 May 2017.
  5. ^ a b Zhuang, P., et al. (1997). Biology and life history of Dabry's sturgeon, Acipenser dabryanus, in the Yangtze River. Environmental Biology of Fishes 48(1-4), 257-64.
  6. ^ a b Xie, J.Y.; W.J. Tang; Y.H. Yang (2018). "Fish assemblage changes over half a century in the Yellow River, China". Ecology and Evolution. 8 (8): 4173–4182. doi:10.1002/ece3.3890. PMC 5916296. PMID 29721289.
  7. ^ a b Li, S.Z. (2015). Fishes of the Yellow River and Beyond. The Sueichan Press. pp. 56–60. ISBN 9789578596771.
  8. ^ Froese, R. and D. Pauly. (Eds.) Acipenser dabryanus. FishBase. 2011.
  9. ^ a b c d Gao, X., et al. (2009). Threatened fishes of the world: Acipenser dabryanus Duméril, 1869. Environmental Biology of Fishes 85(2), 117-18.